Electromagnetic and Light Scattering by Particles N e w s l e t t e r July 2024 Issue 120_1
Previous issues	Joop W. Hovenier (September 9, 1936 - July 12, 2024) Professor Dr. Joop W. Hovenier passed away on July 12^th, 2024. He dedicated his working life to radiative transfer and light scattering: it will be very hard to find someone in this field that has never read one of his papers. Professor Hovenier started working on polarized light at Leiden Observatory in 1967. His PhD supervisor, Henk van de Hulst, had shown him a plot of the polarization of Venus as a function of the phase angle and Joop had agreed to work on a good interpretation of these observations in terms of the microphysical properties of the cloud particles. He soon realized that there were only three fundamental symmetry principles governing the scattering of polarized light. He documented this fundamental result in his first paper, published in 1969. These insights enabled the efficient computer calculations of multiple light scattering that proved crucial for his next endeavor. After defending his PhD-thesis 'Polarized Light in Planetary Atmospheres' in 1970, Joop collaborated on the interpretation of the Venusian polarization with Dr. James Hansen of NASA's Goddard Institute for Space Studies (GISS). The result was the famous 1974 paper entitled 'Interpretation of the Polarization of Venus', which showed that the Venusian cloud droplets differed little in size, had an effective radius of 1.05 microns, and consisted of sulfuric acid solution. That paper still pertains to a spectacular achievement in planetary remote sensing and has been cited more than 350 times. In the meantime, Joop started a research group at the Vrije Universiteit (Free University) in Amsterdam. Over the years, his group worked on theoretical and applied research on remote sensing of planetary atmospheres, including the Earth's. More than 60 undergraduate students did their master research projects, 13 PhD theses were completed, and an advanced laboratory for accurate measurements of polarized light scattering by small, irregularly shaped particles was set-up. The research results obtained by Joop, his students, postdocs and other collaborators have been documented in numerous papers, such as the development of the vector adding/doubling technique, the analysis of fundamental symmetry properties of matrices transforming the Stokes parameters, and the frequently cited review of polarized radiative transfer. The culmination of Joop's research is the monograph on multiple scattering of polarized light in planetary atmospheres. In 1995, Joop organized the first International Workshop on 'Light Scattering by Non-Spherical Particles' at the Free University in Amsterdam. This workshop led to a special issue of the Journal of Quantitative Spectroscopy and Radiative Transfer and triggered a whole series of conferences, each followed by a special JQSRT issue. Joop, his close collaborator Michael Mishchenko, and Larry Travis edited a book on light scattering by non-spherical particles and has served for many years as an Associate Editor and an Advisory Committee member of JQSRT. Joop's extensive career included memberships in a various boards and committees as well as in numerous scientific committees of international symposia, workshops, and conferences. Joop's retirement in 1999 was marked with a dedicated workshop at the Astronomical Institute 'Anton Pannekoek' of the University of Amsterdam to celebrate his work, which also led to a special issue of JQSRT. Since then Joop worked as emeritus professor at the 'Anton Pannekoek Institute where for years he remained actively involved in research, even venturing into polarized radiative transfer in atmospheres of exoplanets. In 2011, Joop received the first Van de Hulst Light Scattering Award, which was instated by publisher Elsevier, and for which an international committee of 32 scientists had selected him. Apart from his huge contribution to science, reactions on his passing mentioned his eye for detail, his professionalism, his friendliness and trustworthiness, his supportive attitude and broad interests, not only in science but also in the people around him. Prof. Hovenier is survived by his partner and two daughters. Daphne Stam and colleagues ================================================================= AGU Fall Meeting 2023 9-13 December 2024 in Washington, D.C., USA. Please consider submitting your abstract to our session: Advances of Atmospheric Remote Sensing Inversion Session ID: 224310 Session Title: A023: Advances of Remote Sensing Inversion Section: Atmospheric Sciences View Session Details in the User Portal: https://agu.confex.com/agu/agu24/gateway.cgi Session Description: - Radiation measurements from satellites, aircraft and the ground have been successfully employed for characterizing radiative properties of aerosols, clouds, atmospheric gases, land, and ocean. One of the challenges is the development of a reliable procedure for inversion of the observations. This session is dedicated to unite works emphasizing the various aspects of numerical inversion that improve quantitatively and/or qualitatively the retrieved atmospheric products. The contributions are expected to address such important attributes of inversion as optimum accounting for errors in the data, inverting multi-source data, utilizing a priori information, inverse modeling and data assimilation, retrieval error estimations, and retrieval acceleration. Development of forward radiative transfer models to improve retrieval is also welcome. We encourage explorations of new retrieval concept and improved products such as aerosol types and profiles, surface particulate matter, trace gas, clouds, and land and ocean properties for existing and next generation of satellite missions and ground-based networks. Invited speakers: Vanderlei Martins (University of Maryland Baltimore County, USA) and Vassilis Amiridis (National Observatory of Athens, Greece) The deadline for all submissions is Wednesday, 31 July 2024 at 23:59 EDT
	Awards ---------------------------------------------------------------------------------------------------------------------------------------------------------- We are happy to inform you that a new "Michael I. Mishchenko Young Scientist Award in Polarimetric Remote Sensing" has been established. We invite you to nominate your young colleagues to this award. The due date for nominations is September 1, 2024 Call for Nominations : https://apolo.loa.univ-lille.fr/2024/07/22/call-for-nominations-2024-michael-i-mischenko-young-scientist-award-in-polarimetric-remote-sensing/ Looking forward for your outstanding nominations, Oleg Dubovik, on behalf of the APOLO conveners Committees ------------------------------------------------------------------------------------------------------------------------------------------------------------ The nomination deadline for the 2024 Goody and Waterman Awards has been extended to September 30, 2024 The deadline for receiving nominations for 2024 Francois Arago Award has been extended to September 1, 2024 ------------------------------------------------------------------------------------------------------------------------------------------------------ Copernicus Medal The Copernicus Gesellschaft e.V., partner of Copernicus Meetings & Publications, invites you and your colleagues to suggest appropriate candidates from the international community of the geo- and space sciences for the Copernicus Medal. The aim of the Copernicus Medal is threefold: 1) It recognizes ingenious, innovative work in the geosciences or in the planetary and space sciences; 2) It recognizes exceptional efforts in community services such as promoting international collaboration, leading engagement in the organization of international conferences, workshops, or summer schools, and engaging in public outreach; 3) It is dedicated to colleagues in the midst of their scientific career (e.g., no later than 20 years after receiving the PhD degree). Any suggestions will be assessed by an international and interdisciplinary committee and the award will be presented at a special commemorative event in April 2025. We kindly ask you to submit your proposal(s) by 15 November 2024 at the latest by email to: copernicus.medal@copernicus.org Please provide the following material: 1) A CV (about 1-2 pages) and a list of up to 10 selected publications or other relevant scientific outcomes (such as datasets, software, etc.); 2) A concise statement of achievements (e.g., "for her/his/their pioneering and ground-breaking work on ocean dynamics and her/his/their excellent leadership in the XYZ Project"); 3) A brief encomium (1-2 pages) of the candidate and their scientific work, but also an outline of recognizable community services such as scientific capacity building, promoting international collaboration, leading engagement in the organization of international conferences, workshops, or summer schools, and engaging in public outreach. Answers to the following questions shall be clearly articulated in terms that a non-expert can understand: 3a) What are the new areas of research they opened up, and how has this revolutionized the discipline? What are the impacts upon society? 3b) Did the person show leadership and not just participate in international activities? In which way go these beyond general serving on committees or convening sessions? 3c) What are the details and the extent of services to real life people or the training of young scientists, in particular from outside their own institution? Thank you very much for your attention. Prof. Dr. Hermann Luehr Prof. Dr. Kristian Schlegel Copernicus Gesellschaft e.V.
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